Bad service at post office

On Monday 8 Oct, I handed in a parcel to be sent overnight. I told the manager, Mandla, that it was urgent. He assured me it would reach it's destination on Wednesday. It did not. When I checked on 'track my parcel' it wasn't even on the system. I went back there, and another person told me it wasn't sent out because they have no transport. And he knew on Monday, that's why he did not enter it on the system. And he did not think to inform me. I also could not get a refund because he is not at the office and the person filling in for him, refuses to refund me. What a terrible way to try and get people to make more use of the post office!